Dominyk Tiller 20c2cbd98a Revert "test-bot: revise Step output transcoding and XML character filtering"
This reverts commit ceed6636d6986bb2b993ba4680ae484deb76ae29.

```
==> git clean -ffdx
HEAD is now at ceed663 test-bot: revise Step output transcoding and XML character filtering
Removing Library/Homebrew/test/.bundle/
Removing Library/Homebrew/test/fs_leak_log
Removing Library/Homebrew/test/vendor/
Error: invalid regular expression: /[^

 -uD7FFuE000-uFFFDu{10000}-u{10FFFF}]/
```
Using Ruby 1.8.
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